/* arch/arm/mach-msm/smd.c * * Copyright (C) 2007 Google, Inc. * Author: Brian Swetland * * This software is licensed under the terms of the GNU General Public * License version 2, as published by the Free Software Foundation, and * may be copied, distributed, and modified under those terms. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include "smd_private.h" #include "proc_comm.h" #if defined(CONFIG_ARCH_QSD8X50) #define CONFIG_QDSP6 1 #endif void (*msm_hw_reset_hook)(void); #define MODULE_NAME "msm_smd" enum { MSM_SMD_DEBUG = 1U << 0, MSM_SMSM_DEBUG = 1U << 0, }; static int msm_smd_debug_mask; struct shared_info { int ready; unsigned state; }; static unsigned dummy_state[SMSM_STATE_COUNT]; static struct shared_info smd_info = { .state = (unsigned) &dummy_state, }; module_param_named(debug_mask, msm_smd_debug_mask, int, S_IRUGO | S_IWUSR | S_IWGRP); static unsigned last_heap_free = 0xffffffff; static inline void notify_other_smsm(void) { msm_a2m_int(5); #ifdef CONFIG_QDSP6 msm_a2m_int(8); #endif } static inline void notify_modem_smd(void) { msm_a2m_int(0); } static inline void notify_dsp_smd(void) { msm_a2m_int(8); } static void smd_diag(void) { char *x; x = smem_find(ID_DIAG_ERR_MSG, SZ_DIAG_ERR_MSG); if (x != 0) { x[SZ_DIAG_ERR_MSG - 1] = 0; pr_info("smem: DIAG '%s'\n", x); } } /* call when SMSM_RESET flag is set in the A9's smsm_state */ static void handle_modem_crash(void) { pr_err("ARM9 has CRASHED\n"); smd_diag(); /* hard reboot if possible */ if (msm_hw_reset_hook) msm_hw_reset_hook(); /* in this case the modem or watchdog should reboot us */ for (;;) ; } uint32_t raw_smsm_get_state(enum smsm_state_item item) { return readl(smd_info.state + item * 4); } static int check_for_modem_crash(void) { if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET) { handle_modem_crash(); return -1; } return 0; } /* the spinlock is used to synchronize between the * irq handler and code that mutates the channel * list or fiddles with channel state */ DEFINE_SPINLOCK(smd_lock); DEFINE_SPINLOCK(smem_lock); /* the mutex is used during open() and close() * operations to avoid races while creating or * destroying smd_channel structures */ static DEFINE_MUTEX(smd_creation_mutex); static int smd_initialized; LIST_HEAD(smd_ch_closed_list); LIST_HEAD(smd_ch_list_modem); LIST_HEAD(smd_ch_list_dsp); static unsigned char smd_ch_allocated[64]; static struct work_struct probe_work; /* how many bytes are available for reading */ static int smd_stream_read_avail(struct smd_channel *ch) { return (ch->recv->head - ch->recv->tail) & ch->fifo_mask; } /* how many bytes we are free to write */ static int smd_stream_write_avail(struct smd_channel *ch) { return ch->fifo_mask - ((ch->send->head - ch->send->tail) & ch->fifo_mask); } static int smd_packet_read_avail(struct smd_channel *ch) { if (ch->current_packet) { int n = smd_stream_read_avail(ch); if (n > ch->current_packet) n = ch->current_packet; return n; } else { return 0; } } static int smd_packet_write_avail(struct smd_channel *ch) { int n = smd_stream_write_avail(ch); return n > SMD_HEADER_SIZE ? n - SMD_HEADER_SIZE : 0; } static int ch_is_open(struct smd_channel *ch) { return (ch->recv->state == SMD_SS_OPENED) && (ch->send->state == SMD_SS_OPENED); } /* provide a pointer and length to readable data in the fifo */ static unsigned ch_read_buffer(struct smd_channel *ch, void **ptr) { unsigned head = ch->recv->head; unsigned tail = ch->recv->tail; *ptr = (void *) (ch->recv_data + tail); if (tail <= head) return head - tail; else return ch->fifo_size - tail; } /* advance the fifo read pointer after data from ch_read_buffer is consumed */ static void ch_read_done(struct smd_channel *ch, unsigned count) { BUG_ON(count > smd_stream_read_avail(ch)); ch->recv->tail = (ch->recv->tail + count) & ch->fifo_mask; ch->send->fTAIL = 1; } /* basic read interface to ch_read_{buffer,done} used * by smd_*_read() and update_packet_state() * will read-and-discard if the _data pointer is null */ static int ch_read(struct smd_channel *ch, void *_data, int len) { void *ptr; unsigned n; unsigned char *data = _data; int orig_len = len; while (len > 0) { n = ch_read_buffer(ch, &ptr); if (n == 0) break; if (n > len) n = len; if (_data) memcpy(data, ptr, n); data += n; len -= n; ch_read_done(ch, n); } return orig_len - len; } static void update_stream_state(struct smd_channel *ch) { /* streams have no special state requiring updating */ } static void update_packet_state(struct smd_channel *ch) { unsigned hdr[5]; int r; /* can't do anything if we're in the middle of a packet */ if (ch->current_packet != 0) return; /* don't bother unless we can get the full header */ if (smd_stream_read_avail(ch) < SMD_HEADER_SIZE) return; r = ch_read(ch, hdr, SMD_HEADER_SIZE); BUG_ON(r != SMD_HEADER_SIZE); ch->current_packet = hdr[0]; } /* provide a pointer and length to next free space in the fifo */ static unsigned ch_write_buffer(struct smd_channel *ch, void **ptr) { unsigned head = ch->send->head; unsigned tail = ch->send->tail; *ptr = (void *) (ch->send_data + head); if (head < tail) { return tail - head - 1; } else { if (tail == 0) return ch->fifo_size - head - 1; else return ch->fifo_size - head; } } /* advace the fifo write pointer after freespace * from ch_write_buffer is filled */ static void ch_write_done(struct smd_channel *ch, unsigned count) { BUG_ON(count > smd_stream_write_avail(ch)); ch->send->head = (ch->send->head + count) & ch->fifo_mask; ch->send->fHEAD = 1; } static void ch_set_state(struct smd_channel *ch, unsigned n) { if (n == SMD_SS_OPENED) { ch->send->fDSR = 1; ch->send->fCTS = 1; ch->send->fCD = 1; } else { ch->send->fDSR = 0; ch->send->fCTS = 0; ch->send->fCD = 0; } ch->send->state = n; ch->send->fSTATE = 1; ch->notify_other_cpu(); } static void do_smd_probe(void) { struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE; if (shared->heap_info.free_offset != last_heap_free) { last_heap_free = shared->heap_info.free_offset; schedule_work(&probe_work); } } static void smd_state_change(struct smd_channel *ch, unsigned last, unsigned next) { ch->last_state = next; pr_info("SMD: ch %d %d -> %d\n", ch->n, last, next); switch (next) { case SMD_SS_OPENING: ch->recv->tail = 0; case SMD_SS_OPENED: if (ch->send->state != SMD_SS_OPENED) ch_set_state(ch, SMD_SS_OPENED); ch->notify(ch->priv, SMD_EVENT_OPEN); break; case SMD_SS_FLUSHING: case SMD_SS_RESET: /* we should force them to close? */ default: ch->notify(ch->priv, SMD_EVENT_CLOSE); } } static void handle_smd_irq(struct list_head *list, void (*notify)(void)) { unsigned long flags; struct smd_channel *ch; int do_notify = 0; unsigned ch_flags; unsigned tmp; spin_lock_irqsave(&smd_lock, flags); list_for_each_entry(ch, list, ch_list) { ch_flags = 0; if (ch_is_open(ch)) { if (ch->recv->fHEAD) { ch->recv->fHEAD = 0; ch_flags |= 1; do_notify |= 1; } if (ch->recv->fTAIL) { ch->recv->fTAIL = 0; ch_flags |= 2; do_notify |= 1; } if (ch->recv->fSTATE) { ch->recv->fSTATE = 0; ch_flags |= 4; do_notify |= 1; } } tmp = ch->recv->state; if (tmp != ch->last_state) smd_state_change(ch, ch->last_state, tmp); if (ch_flags) { ch->update_state(ch); ch->notify(ch->priv, SMD_EVENT_DATA); } } if (do_notify) notify(); spin_unlock_irqrestore(&smd_lock, flags); do_smd_probe(); } static irqreturn_t smd_modem_irq_handler(int irq, void *data) { handle_smd_irq(&smd_ch_list_modem, notify_modem_smd); return IRQ_HANDLED; } #if defined(CONFIG_QDSP6) static irqreturn_t smd_dsp_irq_handler(int irq, void *data) { handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd); return IRQ_HANDLED; } #endif static void smd_fake_irq_handler(unsigned long arg) { handle_smd_irq(&smd_ch_list_modem, notify_modem_smd); handle_smd_irq(&smd_ch_list_dsp, notify_dsp_smd); } static DECLARE_TASKLET(smd_fake_irq_tasklet, smd_fake_irq_handler, 0); static inline int smd_need_int(struct smd_channel *ch) { if (ch_is_open(ch)) { if (ch->recv->fHEAD || ch->recv->fTAIL || ch->recv->fSTATE) return 1; if (ch->recv->state != ch->last_state) return 1; } return 0; } void smd_sleep_exit(void) { unsigned long flags; struct smd_channel *ch; int need_int = 0; spin_lock_irqsave(&smd_lock, flags); list_for_each_entry(ch, &smd_ch_list_modem, ch_list) { if (smd_need_int(ch)) { need_int = 1; break; } } list_for_each_entry(ch, &smd_ch_list_dsp, ch_list) { if (smd_need_int(ch)) { need_int = 1; break; } } spin_unlock_irqrestore(&smd_lock, flags); do_smd_probe(); if (need_int) { if (msm_smd_debug_mask & MSM_SMD_DEBUG) pr_info("smd_sleep_exit need interrupt\n"); tasklet_schedule(&smd_fake_irq_tasklet); } } void smd_kick(smd_channel_t *ch) { unsigned long flags; unsigned tmp; spin_lock_irqsave(&smd_lock, flags); ch->update_state(ch); tmp = ch->recv->state; if (tmp != ch->last_state) { ch->last_state = tmp; if (tmp == SMD_SS_OPENED) ch->notify(ch->priv, SMD_EVENT_OPEN); else ch->notify(ch->priv, SMD_EVENT_CLOSE); } ch->notify(ch->priv, SMD_EVENT_DATA); ch->notify_other_cpu(); spin_unlock_irqrestore(&smd_lock, flags); } static int smd_is_packet(int chn, unsigned type) { type &= SMD_KIND_MASK; if (type == SMD_KIND_PACKET) return 1; if (type == SMD_KIND_STREAM) return 0; /* older AMSS reports SMD_KIND_UNKNOWN always */ if ((chn > 4) || (chn == 1)) return 1; else return 0; } static int smd_stream_write(smd_channel_t *ch, const void *_data, int len) { void *ptr; const unsigned char *buf = _data; unsigned xfer; int orig_len = len; if (len < 0) return -EINVAL; while ((xfer = ch_write_buffer(ch, &ptr)) != 0) { if (!ch_is_open(ch)) break; if (xfer > len) xfer = len; memcpy(ptr, buf, xfer); ch_write_done(ch, xfer); len -= xfer; buf += xfer; if (len == 0) break; } ch->notify_other_cpu(); return orig_len - len; } static int smd_packet_write(smd_channel_t *ch, const void *_data, int len) { unsigned hdr[5]; if (len < 0) return -EINVAL; if (smd_stream_write_avail(ch) < (len + SMD_HEADER_SIZE)) return -ENOMEM; hdr[0] = len; hdr[1] = hdr[2] = hdr[3] = hdr[4] = 0; smd_stream_write(ch, hdr, sizeof(hdr)); smd_stream_write(ch, _data, len); return len; } static int smd_stream_read(smd_channel_t *ch, void *data, int len) { int r; if (len < 0) return -EINVAL; r = ch_read(ch, data, len); if (r > 0) ch->notify_other_cpu(); return r; } static int smd_packet_read(smd_channel_t *ch, void *data, int len) { unsigned long flags; int r; if (len < 0) return -EINVAL; if (len > ch->current_packet) len = ch->current_packet; r = ch_read(ch, data, len); if (r > 0) ch->notify_other_cpu(); spin_lock_irqsave(&smd_lock, flags); ch->current_packet -= r; update_packet_state(ch); spin_unlock_irqrestore(&smd_lock, flags); return r; } static int smd_alloc_channel(const char *name, uint32_t cid, uint32_t type) { struct smd_channel *ch; ch = kzalloc(sizeof(struct smd_channel), GFP_KERNEL); if (ch == 0) { pr_err("smd_alloc_channel() out of memory\n"); return -1; } ch->n = cid; if (_smd_alloc_channel(ch)) { kfree(ch); return -1; } ch->fifo_mask = ch->fifo_size - 1; ch->type = type; if ((type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM) ch->notify_other_cpu = notify_modem_smd; else ch->notify_other_cpu = notify_dsp_smd; if (smd_is_packet(cid, type)) { ch->read = smd_packet_read; ch->write = smd_packet_write; ch->read_avail = smd_packet_read_avail; ch->write_avail = smd_packet_write_avail; ch->update_state = update_packet_state; } else { ch->read = smd_stream_read; ch->write = smd_stream_write; ch->read_avail = smd_stream_read_avail; ch->write_avail = smd_stream_write_avail; ch->update_state = update_stream_state; } if ((type & 0xff) == 0) memcpy(ch->name, "SMD_", 4); else memcpy(ch->name, "DSP_", 4); memcpy(ch->name + 4, name, 20); ch->name[23] = 0; ch->pdev.name = ch->name; ch->pdev.id = -1; pr_info("smd_alloc_channel() cid=%02d size=%05d '%s'\n", ch->n, ch->fifo_size, ch->name); mutex_lock(&smd_creation_mutex); list_add(&ch->ch_list, &smd_ch_closed_list); mutex_unlock(&smd_creation_mutex); platform_device_register(&ch->pdev); return 0; } static void smd_channel_probe_worker(struct work_struct *work) { struct smd_alloc_elm *shared; unsigned ctype; unsigned type; unsigned n; shared = smem_find(ID_CH_ALLOC_TBL, sizeof(*shared) * 64); if (!shared) { pr_err("smd: cannot find allocation table\n"); return; } for (n = 0; n < 64; n++) { if (smd_ch_allocated[n]) continue; if (!shared[n].ref_count) continue; if (!shared[n].name[0]) continue; ctype = shared[n].ctype; type = ctype & SMD_TYPE_MASK; /* DAL channels are stream but neither the modem, * nor the DSP correctly indicate this. Fixup manually. */ if (!memcmp(shared[n].name, "DAL", 3)) ctype = (ctype & (~SMD_KIND_MASK)) | SMD_KIND_STREAM; type = shared[n].ctype & SMD_TYPE_MASK; if ((type == SMD_TYPE_APPS_MODEM) || (type == SMD_TYPE_APPS_DSP)) if (!smd_alloc_channel(shared[n].name, shared[n].cid, ctype)) smd_ch_allocated[n] = 1; } } static void do_nothing_notify(void *priv, unsigned flags) { } struct smd_channel *smd_get_channel(const char *name) { struct smd_channel *ch; mutex_lock(&smd_creation_mutex); list_for_each_entry(ch, &smd_ch_closed_list, ch_list) { if (!strcmp(name, ch->name)) { list_del(&ch->ch_list); mutex_unlock(&smd_creation_mutex); return ch; } } mutex_unlock(&smd_creation_mutex); return NULL; } int smd_open(const char *name, smd_channel_t **_ch, void *priv, void (*notify)(void *, unsigned)) { struct smd_channel *ch; unsigned long flags; if (smd_initialized == 0) { pr_info("smd_open() before smd_init()\n"); return -ENODEV; } ch = smd_get_channel(name); if (!ch) return -ENODEV; if (notify == 0) notify = do_nothing_notify; ch->notify = notify; ch->current_packet = 0; ch->last_state = SMD_SS_CLOSED; ch->priv = priv; *_ch = ch; spin_lock_irqsave(&smd_lock, flags); if ((ch->type & SMD_TYPE_MASK) == SMD_TYPE_APPS_MODEM) list_add(&ch->ch_list, &smd_ch_list_modem); else list_add(&ch->ch_list, &smd_ch_list_dsp); /* If the remote side is CLOSING, we need to get it to * move to OPENING (which we'll do by moving from CLOSED to * OPENING) and then get it to move from OPENING to * OPENED (by doing the same state change ourselves). * * Otherwise, it should be OPENING and we can move directly * to OPENED so that it will follow. */ if (ch->recv->state == SMD_SS_CLOSING) { ch->send->head = 0; ch_set_state(ch, SMD_SS_OPENING); } else { ch_set_state(ch, SMD_SS_OPENED); } spin_unlock_irqrestore(&smd_lock, flags); smd_kick(ch); return 0; } int smd_close(smd_channel_t *ch) { unsigned long flags; pr_info("smd_close(%p)\n", ch); if (ch == 0) return -1; spin_lock_irqsave(&smd_lock, flags); ch->notify = do_nothing_notify; list_del(&ch->ch_list); ch_set_state(ch, SMD_SS_CLOSED); spin_unlock_irqrestore(&smd_lock, flags); mutex_lock(&smd_creation_mutex); list_add(&ch->ch_list, &smd_ch_closed_list); mutex_unlock(&smd_creation_mutex); return 0; } int smd_read(smd_channel_t *ch, void *data, int len) { return ch->read(ch, data, len); } int smd_write(smd_channel_t *ch, const void *data, int len) { return ch->write(ch, data, len); } int smd_write_atomic(smd_channel_t *ch, const void *data, int len) { unsigned long flags; int res; spin_lock_irqsave(&smd_lock, flags); res = ch->write(ch, data, len); spin_unlock_irqrestore(&smd_lock, flags); return res; } int smd_read_avail(smd_channel_t *ch) { return ch->read_avail(ch); } int smd_write_avail(smd_channel_t *ch) { return ch->write_avail(ch); } int smd_wait_until_readable(smd_channel_t *ch, int bytes) { return -1; } int smd_wait_until_writable(smd_channel_t *ch, int bytes) { return -1; } int smd_cur_packet_size(smd_channel_t *ch) { return ch->current_packet; } /* ------------------------------------------------------------------------- */ void *smem_alloc(unsigned id, unsigned size) { return smem_find(id, size); } void *smem_item(unsigned id, unsigned *size) { struct smem_shared *shared = (void *) MSM_SHARED_RAM_BASE; struct smem_heap_entry *toc = shared->heap_toc; if (id >= SMEM_NUM_ITEMS) return 0; if (toc[id].allocated) { *size = toc[id].size; return (void *) (MSM_SHARED_RAM_BASE + toc[id].offset); } else { *size = 0; } return 0; } void *smem_find(unsigned id, unsigned size_in) { unsigned size; void *ptr; ptr = smem_item(id, &size); if (!ptr) return 0; size_in = ALIGN(size_in, 8); if (size_in != size) { pr_err("smem_find(%d, %d): wrong size %d\n", id, size_in, size); return 0; } return ptr; } static irqreturn_t smsm_irq_handler(int irq, void *data) { unsigned long flags; unsigned apps, modm; spin_lock_irqsave(&smem_lock, flags); apps = raw_smsm_get_state(SMSM_STATE_APPS); modm = raw_smsm_get_state(SMSM_STATE_MODEM); if (msm_smd_debug_mask & MSM_SMSM_DEBUG) pr_info("\n", apps, modm); if (modm & SMSM_RESET) handle_modem_crash(); do_smd_probe(); spin_unlock_irqrestore(&smem_lock, flags); return IRQ_HANDLED; } int smsm_change_state(enum smsm_state_item item, uint32_t clear_mask, uint32_t set_mask) { unsigned long addr = smd_info.state + item * 4; unsigned long flags; unsigned state; if (!smd_info.ready) return -EIO; spin_lock_irqsave(&smem_lock, flags); if (raw_smsm_get_state(SMSM_STATE_MODEM) & SMSM_RESET) handle_modem_crash(); state = (readl(addr) & ~clear_mask) | set_mask; writel(state, addr); if (msm_smd_debug_mask & MSM_SMSM_DEBUG) pr_info("smsm_change_state %d %x\n", item, state); notify_other_smsm(); spin_unlock_irqrestore(&smem_lock, flags); return 0; } uint32_t smsm_get_state(enum smsm_state_item item) { unsigned long flags; uint32_t rv; spin_lock_irqsave(&smem_lock, flags); rv = readl(smd_info.state + item * 4); if (item == SMSM_STATE_MODEM && (rv & SMSM_RESET)) handle_modem_crash(); spin_unlock_irqrestore(&smem_lock, flags); return rv; } #ifdef CONFIG_ARCH_MSM_SCORPION int smsm_set_sleep_duration(uint32_t delay) { struct msm_dem_slave_data *ptr; ptr = smem_find(SMEM_APPS_DEM_SLAVE_DATA, sizeof(*ptr)); if (ptr == NULL) { pr_err("smsm_set_sleep_duration \n"); return -EIO; } if (msm_smd_debug_mask & MSM_SMSM_DEBUG) pr_info("smsm_set_sleep_duration %d -> %d\n", ptr->sleep_time, delay); ptr->sleep_time = delay; return 0; } #else int smsm_set_sleep_duration(uint32_t delay) { uint32_t *ptr; ptr = smem_find(SMEM_SMSM_SLEEP_DELAY, sizeof(*ptr)); if (ptr == NULL) { pr_err("smsm_set_sleep_duration \n"); return -EIO; } if (msm_smd_debug_mask & MSM_SMSM_DEBUG) pr_info("smsm_set_sleep_duration %d -> %d\n", *ptr, delay); *ptr = delay; return 0; } #endif int smd_core_init(void) { int r; pr_info("smd_core_init()\n"); /* wait for essential items to be initialized */ for (;;) { unsigned size; void *state; state = smem_item(SMEM_SMSM_SHARED_STATE, &size); if (size == SMSM_V1_SIZE || size == SMSM_V2_SIZE) { smd_info.state = (unsigned)state; break; } } smd_info.ready = 1; r = request_irq(INT_A9_M2A_0, smd_modem_irq_handler, IRQF_TRIGGER_RISING, "smd_dev", 0); if (r < 0) return r; r = enable_irq_wake(INT_A9_M2A_0); if (r < 0) pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_0\n"); r = request_irq(INT_A9_M2A_5, smsm_irq_handler, IRQF_TRIGGER_RISING, "smsm_dev", 0); if (r < 0) { free_irq(INT_A9_M2A_0, 0); return r; } r = enable_irq_wake(INT_A9_M2A_5); if (r < 0) pr_err("smd_core_init: enable_irq_wake failed for A9_M2A_5\n"); #if defined(CONFIG_QDSP6) r = request_irq(INT_ADSP_A11, smd_dsp_irq_handler, IRQF_TRIGGER_RISING, "smd_dsp", 0); if (r < 0) { free_irq(INT_A9_M2A_0, 0); free_irq(INT_A9_M2A_5, 0); return r; } #endif /* check for any SMD channels that may already exist */ do_smd_probe(); /* indicate that we're up and running */ smsm_change_state(SMSM_STATE_APPS, ~0, SMSM_INIT | SMSM_SMDINIT | SMSM_RPCINIT | SMSM_RUN); #ifdef CONFIG_ARCH_MSM_SCORPION smsm_change_state(SMSM_STATE_APPS_DEM, ~0, 0); #endif pr_info("smd_core_init() done\n"); return 0; } static int __devinit msm_smd_probe(struct platform_device *pdev) { pr_info("smd_init()\n"); /* * If we haven't waited for the ARM9 to boot up till now, * then we need to wait here. Otherwise this should just * return immediately. */ proc_comm_boot_wait(); INIT_WORK(&probe_work, smd_channel_probe_worker); if (smd_core_init()) { pr_err("smd_core_init() failed\n"); return -1; } do_smd_probe(); msm_check_for_modem_crash = check_for_modem_crash; msm_init_last_radio_log(THIS_MODULE); smd_initialized = 1; return 0; } static struct platform_driver msm_smd_driver = { .probe = msm_smd_probe, .driver = { .name = MODULE_NAME, .owner = THIS_MODULE, }, }; static int __init msm_smd_init(void) { return platform_driver_register(&msm_smd_driver); } module_init(msm_smd_init); MODULE_DESCRIPTION("MSM Shared Memory Core"); MODULE_AUTHOR("Brian Swetland "); MODULE_LICENSE("GPL");